3KP16-B Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The 3KP16-B is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 16V reverse standoff voltage with a 27.3V maximum clamping voltage and 115.4A peak pulse current capability in a through-hole P600 axial package. The 3KP16-B is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Suitable alternatives maintain the same voltage class and electrical performance characteristics while offering active product status from current manufacturers.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	16V
Voltage - Breakdown (Min)	16.88V
Voltage - Clamping (Max) @ Ipp	27.3V
Current - Peak Pulse (10/1000µs)	115.4A
Power - Peak Pulse	3000W
Operating Temperature Range	-55°C to 175°C (TJ)
Mounting Type	Through Hole
Package / Case	P600, Axial
Type	Zener
Unidirectional Channels	1
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 3KP16-B are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Voltage - Reverse Standoff: 16V (exact match required)
Voltage - Clamping (Max) @ Ipp: 26V to 28.8V (acceptable range for 16V class suppressors)
Current - Peak Pulse: 115.4A minimum (higher values acceptable for enhanced protection)
Power - Peak Pulse: 3000W minimum (higher values acceptable)
Operating Temperature: -55°C to 175°C (exact match)
Mounting Type: Through Hole (exact match)
Package / Case: P600 or R-6 axial (mechanically compatible)
Type: Zener, Unidirectional (exact match)
RoHS Status: ROHS3 Compliant (exact match)

Substitute parts are grouped into two categories: direct electrical equivalents with P600 packaging and mechanical alternatives with R-6 packaging. All listed substitutes maintain the 16V voltage class and are suitable for general-purpose transient voltage suppression applications.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse	Power - Peak Pulse	Package / Case	Product Status
3KP16-B	Littelfuse Inc.	16V	27.3V	115.4A	3000W	P600, Axial	Obsolete
5KP16A-B	Littelfuse	16V	26V	196.2A	5000W	P600, Axial	Active
3KP16A-TP	Micro Commercial Co	16V	26V	115.4A	3000W	R-6, Axial	Active
5KP16A-E3/54	Vishay General Semiconductor - Diodes Division	16V	26V	192A	5000W	P600, Axial	Active
5KP16A-E3/73	Vishay General Semiconductor - Diodes Division	16V	26V	192A	5000W	P600, Axial	Active
5KP16A-TP	Micro Commercial Co	16V	26V	—	5000W	R-6, Axial	Active
5KP16AE3/TR13	Microchip Technology	16V	26V	192A	5000W	P600, Axial	Active
5KP16AHE3/54	Vishay General Semiconductor - Diodes Division	16V	26V	192A	5000W	P600, Axial	Active
5KP16AHE3/73	Vishay General Semiconductor - Diodes Division	16V	26V	192A	5000W	P600, Axial	Active
5KP16E3/TR13	Microchip Technology	16V	28.8V	174A	5000W	P600, Axial	Active

Engineering Selection Recommendations

All listed substitute parts are ROHS3 compliant and maintain the required operating temperature range of -55°C to 175°C. Selection between substitutes depends on specific application requirements:

For direct P600 package replacement with enhanced performance, the 5KP16A-B, 5KP16A-E3/54, 5KP16A-E3/73, 5KP16AE3/TR13, 5KP16AHE3/54, and 5KP16AHE3/73 are suitable. These parts offer higher peak pulse current (192A to 196.2A) and increased power dissipation (5000W), providing superior transient protection compared to the original 3KP16-B.

For applications requiring identical electrical performance (115.4A peak pulse current, 3000W power dissipation) with active product status, the 3KP16A-TP from Micro Commercial Co is the closest match, though it uses the R-6 axial package instead of P600.

The 5KP16E3/TR13 offers the highest clamping voltage (28.8V) among substitutes, suitable for applications requiring additional voltage margin.

The 5KP16AHE3/54 and 5KP16AHE3/73 variants include automotive-grade qualification (AEC-Q101), appropriate for automotive and harsh-environment applications.

Frequently Asked Questions (FAQ)

Q: Can I use a 5KP series part as a direct replacement for the 3KP16-B?

A: Yes. The 5KP series maintains the same 16V reverse standoff voltage and operates within the acceptable clamping voltage range (26V to 28.8V). The 5KP series offers higher peak pulse current and power dissipation, providing enhanced protection. Electrical compatibility is confirmed; however, verify PCB layout compatibility with the selected package variant (P600 or R-6).

Q: What is the difference between P600 and R-6 packages?

A: Both are through-hole axial packages suitable for the same mounting method. P600 and R-6 differ in physical dimensions and lead spacing. Verify PCB pad spacing and component clearance before selecting a package variant. The 3KP16A-TP uses R-6 packaging while most 5KP variants use P600.

Q: Are the automotive-grade variants (5KP16AHE3/54 and 5KP16AHE3/73) suitable for non-automotive applications?

A: Yes. Automotive-grade parts with AEC-Q101 qualification meet or exceed general-purpose requirements and are suitable for any application requiring the specified electrical characteristics. These variants provide additional reliability assurance.

Q: What is the significance of the clamping voltage difference between 26V and 28.8V?

A: Both values fall within the acceptable range for 16V class suppressors. The 26V clamping voltage (5KP16A variants) provides tighter voltage regulation, while the 28.8V clamping voltage (5KP16E3/TR13) allows slightly higher transient peaks. Select based on circuit protection requirements and maximum allowable voltage at the protected node.

Q: Can I substitute the 3KP16-B with a higher power-rated part (5000W instead of 3000W)?

A: Yes. Higher power-rated parts provide enhanced transient suppression capability without compromising circuit compatibility. The 5KP series with 5000W rating is suitable for applications where the original 3000W rating may be marginal or where additional protection margin is desired.

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